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Replace Mear m21 thermostat
Handy2016
Dec 10, 2016, 11:17 AM
Need to know how to replace 4 wire Mear m21 thermostat to a two wire Honeywell RLV4305 thermostat
ma0641
Dec 10, 2016, 12:35 PM
Typically a 4 wire would be for heat and air while a 2 wire is heat OR AC only. Is that what you have?